Just read the ad. from our sponsor and see that they can take the 1.8T from 150bhp to 192bhp.

Hmmmm.

Anyone done this and - crucially - what happened to petrol consumption at like-for-like speeds??

At a steady 60mph on a level road my 1.8T will indicate 41.0 mpg.
At the same speed what would Protune-chipped engine return?

I know that if the full whack is used then fuel will disappear (I have got the 1.8T to show as little as 22mpg ! )